Hi Nico, Using interrupts to read the state of push button is generally a bad idea because of button bouncing. It means that the button during transition from stable low state to stable high state will generate a very fast (kilo hertz) square wave. The interrupt will try to execute many times on every rising edge. There are many solutions for this under "push-button debouncing". I understand that this circuit is just for tests. Anyway bouncing will influence the test. There is a confirmed issue with interrupts handling on UDOO neo board.